Explanation

Aluminum (Al) is a metal that can easily lose electrons to form ions, making it a reducing agent.

As a reducing agent, aluminum can donate electrons to other substances, causing them to be reduced.

Explanation

The presence of an enzyme does not affect the nature or properties of the end products of a chemical reaction.

Enzymes only speed up the reaction, they do not change the final result.

The end products are the same, regardless of whether an enzyme is present or not.

Explanation

In a solid, the particles (atoms, molecules, or ions) are closely packed and vibrate in place, holding their position in the crystal lattice.

This vibration is due to thermal energy, and the particles oscillate around their fixed positions.

Key Points:

• In a gas, particles are widely spaced and move freely.
• In a liquid, particles are close together but move past each other.

Explanation

Limiting frictional force (also known as static friction) is greater than:

• Rolling friction (because rolling friction is much smaller, as it only opposes the motion of an object that is already rolling)
• Sliding friction (which is another term for kinetic friction)
• Kinetic friction (which is the frictional force that acts when an object is already moving)

Explanation

The cell membrane is also known as the plasma membrane.

It is composed of a double layer of lipids, specifically phospholipids.

Explanation

Each mole of ATP (Adenosine Triphosphate) stores energy equivalent to:

• 7.3 kilocalories (kcal) per mole (approximately)
• 17.3 kilojoules (kJ) per mole (approximately)

Explanation

Fish is an excellent source of protein.

It is essential for building and repairing muscles, organs, and tissues in the body.

Explanation

Metabolic reactions are both constructive (anabolic) and destructive (catabolic) reactions.

Explanation

Significant figures (also known as significant digits) are the number of digits in a measurement or calculation that are known to be reliable and accurate, including the first doubtful digit.

For example, the measurement "23.4 cm" has four significant figures, while "23.40 cm" has five significant figures.

Explanation

• When one atom loses an electron to form a cation and another atom gains that electron to form an anion, the resulting attraction between the oppositely charged ions is an ionic bond.
• This type of bond is typically formed between a metal and a nonmetal, and is characterized by a transfer of electrons rather than a sharing of electrons (as in covalent bonds).